from drf_yasg2.utils import swagger_auto_schema
from rest_framework import status
from rest_framework import viewsets
from rest_framework.permissions import AllowAny, IsAuthenticated
from common.customresponse import CustomResponse
from api.mypage import MyPage

class CustomModelViewSet(viewsets.ModelViewSet):

    # CreateModelMixin->create
    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return CustomResponse(data=serializer.data, code=201,msg="OK", status=status.HTTP_201_CREATED,headers=headers)

    # ListModelMixin->list
    def list(self, request, *args, **kwargs):
        queryset = self.filter_queryset(self.get_queryset())
        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return self.get_paginated_response(serializer.data)

        serializer = self.get_serializer(queryset, many=True)
        return CustomResponse(data=serializer.data, code=200, msg="OK", status=status.HTTP_200_OK)

    # RetrieveModelMixin->retrieve
    def retrieve(self, request, *args, **kwargs):
        instance = self.get_object()
        serializer = self.get_serializer(instance)
        return CustomResponse(data=serializer.data, code=200, msg="OK", status=status.HTTP_200_OK)

    # UpdateModelMixin->update
    def update(self, request, *args, **kwargs):
        partial = kwargs.pop('partial', False)
        instance = self.get_object()
        serializer = self.get_serializer(instance, data=request.data, partial=partial)
        serializer.is_valid(raise_exception=True)
        self.perform_update(serializer)

        if getattr(instance, '_prefetched_objects_cache', None):
            # If 'prefetch_related' has been applied to a queryset, we need to
            # forcibly invalidate the prefetch cache on the instance.
            instance._prefetched_objects_cache = {}

        return CustomResponse(data=serializer.data, code=200, msg="OK", status=status.HTTP_200_OK)

    # DestroyModelMixin->destroy
    def destroy(self, request, *args, **kwargs):
        instance = self.get_object()
        self.perform_destroy(instance)
        return CustomResponse(data=[], code=200, msg="OK", status=status.HTTP_200_OK)

    def get_permissions(self):
        """
        Instantiates and returns the list of permissions that this view requires.
        """
        if self.action in ['list', 'retrieve']:
            # 对于list方法，返回AllowAny权限类，表示不需要鉴权
            permission_classes = [AllowAny, ]
        else:
            # 对于其他方法，返回IsAuthenticated权限类，表示需要用户已认证
            permission_classes = [IsAuthenticated, ]
        return [permission() for permission in permission_classes]
